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The camshaft is a component in a piston engine. Its function is to control the opening and closing of the valve. Although the speed of the camshaft in a four-stroke engine is half that of the crankshaft (the speed of the camshaft in a two-stroke engine is the same as the crankshaft), it usually still has a high speed and needs to withstand a lot of torque. Camshafts have high requirements in terms of strength and support, and their materials are generally high-quality alloy steel or alloy steel. Since the valve motion law is related to the power and operating characteristics of an engine, the camshaft design occupies a very important position in the engine design process.
Cam bearings are subjected to periodic shock loads. The contact stress between the cam and the tappet is very large, and the relative sliding speed is also high, so the wear of the working surface of the cam is relatively serious. In view of this situation, in addition to high dimensional accuracy, small surface roughness and sufficient rigidity, the camshaft journal and cam working surface should also have high wear resistance and good lubrication.
Camshafts are usually forged from high-quality carbon steel or alloy steel, and can also be cast from alloy cast iron or ductile iron. The journal and cam working surfaces are ground after heat treatment.
Cummins engines are mainly used in commercial vehicles, construction machinery, mining equipment, marine power and generator sets, etc.
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